I recently purchased a Zenith ZHX-313 Home Theatre-in-a-Box and have been happy with it so far. I've used some of speakers as the front left/right and as the back speakers. The other day, I tried to show my friend a DVD on it and I noticed that there was no sound but instead this constant beating sound as if it was a faint hearbeat. I suspected that there may be some crossed cables and that I was getting feedback, but I found no such problems. Is my receiver bad or what? Hopefully someone can help because I'm pretty new to the whole audio thing.
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